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Discriminatory profile of rDNA sites and trend for acrocentric chromosome formation in the genus Trachinotus Lacépède, 1801 (Perciformes, Carangidae)

by: Molina, Wagner; Jacobina, Uedson; Vicari, Marcelo; Bertollo, Luiz

Publication date: 2012-10-31
Usage: Attribution 4.0 International
Topics: Carangidae, 18S rDNA, 5S rDNA, cytotaxonomic markers, evolutionary pathways
Publisher: Pensoft Publishers
Collection: biodiversity
Contributor: Pensoft Publishers
Language: English
Rights: https://biodiversitylibrary.org/permissions
Rights-holder: Copyright held by individual article author(s).
Volume: 6
Item Size: 12.3M

Abstract: Chromosomal traits have provided valuable information for phylogeny and taxonomy of several fish groups. Three Atlantic Carangidae species of the genus Trachinotus Lacépède, 1801 (T. goodei Jordan et Evermann, 1896, T. carolinus (Linnaeus, 1766) and T. falcatus (Linnaeus, 1758)) were investigated,2n=48 chromosomes but different chromosomal arms (FN number), i.e., 52, 56 and 58, respectively, in view of the different number of two-armed chromosomes found in their karyotypes. Thus, T. goodei, T. carolinus and T. falcatus present a progressive distance from the probable basal karyotype proposed for Perciformes (2n=48 acrocentrics, FN=48). At first sight, these findings do not agree with the phylogenetic hypothesis based on mitochondrial sequences, where T. goodei appear as the most derived species, followed by T. falcatus and T. carolinus, respectively. However, the chromosomal mapping of ribosomal DNAs was informative for clarifying this apparent conflict. Indeed, the multiple 5S and 18S rDNA sites found in T. goodei corroborate the most derived condition for this species. In this sense, the occurrence of the unexpected number of two-armed chromosomes and FN value for this species, as well as for T. carolinus, must be due to additional rounds of acrocentric formation in these species, modifying the macrostructure of their karyotypes.
Addeddate: 2025-03-16 15:09:36
Bhl_virtual_titleid: 210879
Bhl_virtual_volume: v.6:no.4 (2012)
Call number: 10_3897_compcytogen_v6i4_3062
Call-number: 10_3897_compcytogen_v6i4_3062
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Genre: article
Identifier: discriminatoryp6moli
Identifier-ark: ark:/13960/s2v96frszp3
Identifier-bib: 10_3897_compcytogen_v6i4_3062
Identifier-doi: 10.3897/compcytogen.v6i4.3062
Issue: 4
Ocr: tesseract 5.3.0-6-g76ae
Ocr_detected_lang: en
Ocr_detected_lang_conf: 1.0000
Ocr_detected_script: Latin
Ocr_detected_script_conf: 1.0000
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Page_range: 359-369
Pages: 11
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Possible copyright status: In copyright. Digitized with the permission of the rights holder.
Ppi: 300
Source: Comparative Cytogenetics 6(4)
Year: 2012